(Solved): When calculating errors of measuring devices, which one of the following is NOT one obvious source ...

When calculating errors of measuring devices, which one of the following is NOT one obvious source of uncertainty? A) The variables measured change in value, for example, the weight fluctuates, so the expected amount is uncertain B) The random error is always present, so the observed amount is not totally certain C) Systematic error is always present, and there is no way to randomize bias D) Because both the observed and the expected measures are uncertain, their difference is uncertain Question 5 $0/4$ points When calculating absolute and relative error, the difference between them is that A) both may be used for any kind of error or any kind of difference, but relative is calculated as a $\%$ of the expected or of reference B) the absolute difference is usually used for systematic error and relative difference is is usually used for the random error C) both may be used for any kind of error or any kind of difference, but absolute is calculated as absolute value of the expected or of reference D) both may be used for any any kind of difference, but only for random error because there is no way to calculate the systematic error